879774921 has 9 divisors (see below), whose sum is σ = 1270914541. Its totient is φ = 586457292.

The previous prime is 879774919. The next prime is 879774941. The reversal of 879774921 is 129477978.

The square root of 879774921 is 29661.

It is a perfect power (a square), and thus also a powerful number.

879774921 is a `hidden beast` number, since 87 + 9 + 77 + 492 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 879774921 - 2¹ = 879774919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (879774941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 84040 + ... + 93926.

Almost surely, 2^879774921 is an apocalyptic number.

879774921 is the 29661-st square number.

879774921 is the 14831-st centered octagonal number.

It is an amenable number.

879774921 is a deficient number, since it is larger than the sum of its proper divisors (391139620).

879774921 is an frugal number, since it uses more digits than its factorization.

879774921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19780 (or 9890 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The cubic root of 879774921 is about 958.2022638407.

The spelling of 879774921 in words is "eight hundred seventy-nine million, seven hundred seventy-four thousand, nine hundred twenty-one".